feat(tracing): Store sample_rand in DSC

[szokeasaurusrex]

Closes #3998

[codecov]

❌ 109 Tests Failed:

Tests completed	Failed	Passed	Skipped
23173	109	23064	5720

View the top 3 failed tests by shortest run time

tests.integrations.httpx.test_httpx test_outgoing_trace_headers_append_to_baggage[httpx_client0]

Stack Traces | 0.051s run time

.../integrations/httpx/test_httpx.py:135: in test_outgoing_trace_headers_append_to_baggage
    assert (
E   AssertionError: assert 'custom=data,sentry-trace_id=01234567890123456789012345678901,sentry-sample_rand=0.07190396862619497,sentry-environment=production,sentry-release=d08ebdb9309e1b004c6f52202de58a09c2268e42,sentry-transaction=............/interactions/other-dogs/new-dog,sentry-sample_rate=1.0,sentry-sampled=true' == 'custom=data,sentry-trace_id=01234567890123456789012345678901,sentry-environment=production,sentry-release=d08ebdb9309e1b004c6f52202de58a09c2268e42,sentry-transaction=............/interactions/other-dogs/new-dog,sentry-sample_rate=1.0,sentry-sampled=true'
E     - custom=data,sentry-trace_id=01234567890123456789012345678901,sentry-environment=production,sentry-release=d08ebdb9309e1b004c6f52202de58a09c2268e42,sentry-transaction=............/interactions/other-dogs/new-dog,sentry-sample_rate=1.0,sentry-sampled=true
E     + custom=data,sentry-trace_id=01234567890123456789012345678901,sentry-sample_rand=0.07190396862619497,sentry-environment=production,sentry-release=d08ebdb9309e1b004c6f52202de58a09c2268e42,sentry-transaction=............/interactions/other-dogs/new-dog,sentry-sample_rate=1.0,sentry-sampled=true
E     ?                                                                     +++++++++++++++++++++++++++++++++++++++

tests.integrations.httpx.test_httpx test_outgoing_trace_headers_append_to_baggage[httpx_client1]

Stack Traces | 0.051s run time

.../integrations/httpx/test_httpx.py:135: in test_outgoing_trace_headers_append_to_baggage
    assert (
E   AssertionError: assert 'custom=data,sentry-trace_id=01234567890123456789012345678901,sentry-sample_rand=0.07190396862619497,sentry-environment=production,sentry-release=d08ebdb9309e1b004c6f52202de58a09c2268e42,sentry-transaction=............/interactions/other-dogs/new-dog,sentry-sample_rate=1.0,sentry-sampled=true' == 'custom=data,sentry-trace_id=01234567890123456789012345678901,sentry-environment=production,sentry-release=d08ebdb9309e1b004c6f52202de58a09c2268e42,sentry-transaction=............/interactions/other-dogs/new-dog,sentry-sample_rate=1.0,sentry-sampled=true'
E     - custom=data,sentry-trace_id=01234567890123456789012345678901,sentry-environment=production,sentry-release=d08ebdb9309e1b004c6f52202de58a09c2268e42,sentry-transaction=............/interactions/other-dogs/new-dog,sentry-sample_rate=1.0,sentry-sampled=true
E     + custom=data,sentry-trace_id=01234567890123456789012345678901,sentry-sample_rand=0.07190396862619497,sentry-environment=production,sentry-release=d08ebdb9309e1b004c6f52202de58a09c2268e42,sentry-transaction=............/interactions/other-dogs/new-dog,sentry-sample_rate=1.0,sentry-sampled=true
E     ?                                                                     +++++++++++++++++++++++++++++++++++++++

tests.integrations.celery.test_celery test_baggage_propagation

Stack Traces | 0.053s run time

.../integrations/celery/test_celery.py:520: in test_baggage_propagation
    assert sorted(result["baggage"].split(",")) == sorted(
E   AssertionError: assert ['custom=value', 'sentry-environment=production', 'sentry-release=abcdef', 'sentry-sample_rand=0.8445520012161253', 'sentry-sample_rate=1.0', 'sentry-sampled=true', 'sentry-trace_id=bc87f5400b104152a897b3ea27b3c1bf'] == ['custom=value', 'sentry-environment=production', 'sentry-release=abcdef', 'sentry-sample_rate=1.0', 'sentry-sampled=true', 'sentry-trace_id=bc87f5400b104152a897b3ea27b3c1bf']
E     At index 3 diff: 'sentry-sample_rand=0.8445520012161253' != 'sentry-sample_rate=1.0'
E     Left contains one more item: 'sentry-trace_id=bc87f5400b104152a897b3ea27b3c1bf'
E     Full diff:
E       [
E        'custom=value',
E        'sentry-environment=production',
E        'sentry-release=abcdef',
E     +  'sentry-sample_rand=0.8445520012161253',
E        'sentry-sample_rate=1.0',
E        'sentry-sampled=true',
E        'sentry-trace_id=bc87f5400b104152a897b3ea27b3c1bf',
E       ]

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